Tool holder



G. F, FICKEN..

TOOL HGLDER.

APPLICATION FILED IULY Z I920.

` 'Patented Feb. 14,

2 Salins-sage- A PPLICATIDN FlLYED JULY 2.1920.

G. F. PICKETT.

TooL HOLDER.

'Patented Feb. 14, 1922.

;` z SHEETS-SHEET 2.

GEORGE FREDERICK PIcKET'r, or LONDON, ENGLAND.

r 'rooiJ HOLDER.

f' Specicaton of Letterslatent.v

Application filed July 2, 1920.-', 'serial No. seam.

To all whom t may :concern: Y. j

Be itkknown that I, yGnonen FREDERICK PICKETT, a subject el the King ofGreat Britain and Ireland, residing at London, England, have invented anImproved Tool Holder, of which fthe following is a speciication. v v 1This invention relates to an improved tool holder or chucksuitableitordrills, taps andV so forth, employed on drillingor other rotarymachines, ofthe quick release type in y which internal cams co-operatewith? Aballs forming the gripping elements.v v Y This invention isdistinguished from lthe prior art in that ,arigid grip of the tool canbeproduced, Vor alternatively afself;

aligning or floating gri rendering .certain of the balls or' grippingelements inoperative. p i i Y Thisv invention, contemplates( broadly, atoolholder'having in combination means 'for producing a rigid grip withmeans for prol ducing` a floating or Y self-aligning grip. MoreYspecifically stated a tooliholder according tothis invention comprisesthe combination with Ya plurality of'tool.grippingde vices or elementsof means Vwhereby a rigid grip is produced, means whereby a floating'grip is produced and means whereby the tool is quickly locked andyreleased.. Further features will transpire inthe 'following descriptionet' theV accompanying drawings, in which Figure 1 is a verticallongitudinal section of the holder or chuck.

Figure 2 is a vertical cross section thereof.

Fig. 3 is a partial view similar to Fig. 1 showing a slightly modiedconstruction, and

Fig. 4 is a cross section on line 4 4 of Fig. 3.

Referring to the drawings the body por tion 1 is fitted with a shank 2and is bored out at 3 to receive a drill or other tool. Holes 4 areprovided to `accommodate two rings of hardened steel balls 5 and 6rcspec` tively. The sleeve 7 embracing the body portion is recessed at Sso as to torni cam surfaces at 9 which engage the balls 5 and 6under'the influence of a garter spring l0 engaging at one end the stud11 carried by a collar 12 and at the other end a stud 19 carried by thesleeve. The stud 11 acts as a stop to prevent sleeve 7 being rotated toofar on the body l.

Collar 12 is keyed to the body so as to slide p can be produced bythereon in the keyways 13. vRecesses 14 and 15 are provided iii thebodyportion anda set screw orA catch 16 in collarV l2 engages one orlother of vthe recesses kas theeollar and sleeve are moved axially oftheholder in one direction or the other. A ring 1'7" screwed on collar 12retains the securing ring ,18,

'which is free to rotate on the collar, in place.

Ring 18 serves for screwing thecollar into or out of the sleeve. Theboreof sleeve -is counter-bored or enlarged at QOan'd a' guide ling21,'sliding on the body` portion,`is screwed into the sleeve. i

. The koperation is yas follows., By rotating sleeve 7 with respect tobody portion l against the action 'of spring 10 8 are opposite theballs, a drill` can .be insert` ed whereupon the balls move radiallyoutwards.` Upon releasing the sleeve spring 1() forces'it round andcauses the cam surfaces 9 toen'gage the ballsy and'ftlius lock the tooliii a 'rigidgrip i In* this positionv catch 16 engages recess 14. Bysliding the collarand sleeve'on the. body until the counter-bore 20 isopposite the balls 5the latter release their grip on .thetoolL In thispositionthe tool isgripped by balls 6 only that is to say in a ifioatingor vself-'aligning grip.

The` arrangement above described is such that a'to'ol can be inserted orremoved and the grip converted from rigid to floating practicallyinstantly. By using a spring catch as shown at 14a in Fig. 3 in place ofthe set screw 16, and merely pulling the sleeve towards the tool therigid grip is converted to the floating grip and vice versa. Theseoperations can be performed. While the Vmachine is running and therebymuch time iirmanipulation is saved.

Another advantage of this invention is that a single holder willaccommodate equally well tools of different sizes that is to say ofdifferent shank diameters and two or three such holders or chucks eachhaving balls of different diameters are sufiicient te hold a wide rangein size of tools.

@although one form of construction has been described vthe invention isnot necessarily limited thereto but may be carried out in various wayswithout departing from the ambit of the claims. For instance, the sleevemay be fitted with a liner 7a, as shown in Fig. 3, consisting ofhardened steel and having the cams and grooves formed therein.

What I claim is 1. In a tool holder means for converting Patented rei).l14., 1922.55

until recesses i the grip into a rigid or ioating grip, comprising incombination a body portion, a plurality of tool gripping elementstherein, a sleeve rotatable about and longitudinally movable upon saidbody portion and cam grooves in said sleeve co-operating with saidgripping elements to produce a rigid grip in one longitudinal positionand a ioating" grip in another longitudinal position of said sleeve andto release the grip when said sleeve isV rotated in one direction.

2. In a tool holder the combination with a body portion having a shankthereon and a bore therein of two rings ofballs mounted in said body asleeve embracing said body, means whereby said sleeve normally.

engages both rings of balls to produce a rigid grip, means whereby onering of balls is rendered inoperative to produce al iioating grip andmeans whereby both rings of balls are rendered inoperative to insertorrelease the tool.

3. In a tool holder the combination with a body portion having a shankthereon and a bore therein of two rings of balls mounted in said body, asleeve embracing said body, cams and grooves in said sleeve cooperatingwith said rings of balls, a spring normally urging said sleeve into thelocking position means for adjusting the position of the sleevelongitudinallyy whereby .one ring of balls is rendered inoperative andmeans for retaining said sleeve in a predetermined position on `saidbody. i y

4. In a tool holder the combination with a body portion having a shankthereon and a bore therein of two rings of balls mounted in saidbody, acollar longitudinally adjustable on said body, means forI retaining saidcollar 1n one of two predetermined positions, 'a sleeve embracing saidbody .and revolubly mounted on said collar, a guide ring carried by saidsleeve and engaging said body, a stop on said collar, a stop on saidsleeve, a spring co-acting with said stops to normally urge the sleeveinto the locking position and cams and grooves in ycollar keyed to thesolid end, a revoluble screw-threaded ring mounted on said collar, aretaining ring for said revoluble rin a stop on said collar, a catch insaid cclar engaging notches in said body, a Sleeve screwed to saidrevoluble ring, a stop within said sleeve a guide rin screwed to saidsleeve and engaging said body, two rings of balls mounted in the holesin said body, grooves in said sleeve permitting said balls to moveradially outwards, cams on said sleeve whereby, said balls 'are forcedradially p inwards, a counter bore in said sleeve rendering one ring ofballs inoperative when said collar and sleeve are displaced longitudi-`nally in one direction and a spring normally urging said. sleeve and atleast one ring of ballsv into the locking position. Y

`Signed at London this June, 1920.

` GEORGE FREDERICK PICKETT. In the presence of- Lors CHASTEAUNEUF, Crus.J. FALooNER.

